(2023) PASS 1Z0-908 Exam Free Practice Test with 100% Accurate Answers
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Oracle 1Z0-908 (MySQL 8.0 Database Administrator) Certification Exam is a highly sought-after certification for professionals who wish to demonstrate their expertise in MySQL 8.0 database administration. MySQL 8.0 Database Administrator certification is designed for database administrators who are responsible for managing and maintaining MySQL databases.
To prepare for the Oracle 1z1-908 exam, candidates should have a solid understanding of MySQL database concepts and hands-on experience with MySQL 8.0. They should also be familiar with common database administration tasks, such as user management, data backup and recovery, and performance tuning. Additionally, candidates should be comfortable working with MySQL command-line tools and have experience with MySQL Workbench, a popular visual database design tool.
NEW QUESTION # 45
Examine these entries from the general query log:
All UPDATE statements reference existing rows.
Which describes the outcome of the sequence of statements?
- A. All statements execute without error.
- B. A deadlock occurs after innodb_lock_wait_timeout seconds.
- C. Connection 24 experiences a lock wait timeout.
- D. A deadlock occurs immediately.
- E. Connection 25 experiences a lock wait timeout.
Answer: B
NEW QUESTION # 46
Examine this query and output:
Which two statements are true? (Choose two.)
- A. The optimizer estimates that 51 rows in the countrytable have Continent = ‘Asia’.
- B. The query returns exactly 125 rows.
- C. The countrytable is accessed as the first table, and then joined to the city table.
- D. 35 rows from the city table are included in the result.
- E. It takes more than 8 milliseconds to sort the rows.
Answer: A,D
NEW QUESTION # 47
Examine this statement:
mysql> DROP ROLE r_role1, r_role2;
Which two are true? (Choose two.)
- A. You must revoke r_role1 and r_role2 from all users and other roles before dropping the roles.
- B. Existing connections can continue to use the roles' privileges until they reconnect.
- C. You must revoke all privileges from r_role1 and r_role2 before dropping the roles.
- D. It fails if any of the roles is specified in the mandatory_roles variable.
- E. It fails if you do not have the ADMIN OPTION of the roles r_role1 and r_role2.
- F. It fails if at least one of the roles does not exist.
Answer: B,E
NEW QUESTION # 48
Examine these InnoDB Cluster parameter settings:
Now examine the partial status:
A permanent network failure isolates host3.
Which two statements are true? (Choose two.)
- A. The primary instance can be specified by using the command
cluster.setPrimaryInstance(<host>:<port>). - B. The instance deployed on host2 is elected as the new primary instance.
- C. The instance deployed on host3 will automatically rejoin the cluster when connectivity is re-established.
- D. The instance deployed on host3 is expelled from the cluster and must be rejoined using cluster.addInstance ('host3:3377')
- E. Failure of the instance deployed on host1 provokes an outage.
- F. The issuing command cluster.switchToMuitiPrimaryMode() will fail to enable multi-primary mode.
Answer: A,C
NEW QUESTION # 49
Which two commands will display indexes on the parts table in the manufacturing schema? (Choose two.)
- A. DESCRIBE manufacturing.parts;
- B. SELECT * FROM information_schema.statistics WHERE table_schema='manufacturing' AND TABLE_NAME='parts';
- C. SELECT * FROM information_schema.COLUMN_STATISTICS;
- D. EXPLAIN SELECT INDEXES FROM manufacturing.parts;
- E. SHOW INDEXES FROM manufacturing.parts;
Answer: B,C
NEW QUESTION # 50
Which two are true about differences between logical and physical upgrades of MySQL databases? (Choose two.)
- A. Logical upgrades are much faster because they do not require restarting the mysqld process.
- B. Physical upgrades are much faster because they do not require restarting the mysqld process.
- C. Post-upgrade table storage requirements after logical upgrades are usually smaller than that after physical upgrades.
- D. Physical upgrades are performed for current instances on bare metal deployments, whereas logical upgrades are used for virtual machines or containerized instances.
- E. Physical upgrades leave data in place, whereas logical upgrades require data to be restored from mysqldump-type backups taken before the upgrades.
- F. Post-upgrade table storage requirements after physical upgrades are usually smaller than that after logical upgrades.
Answer: A,E
NEW QUESTION # 51
Which four are types of information stored in the MySQL data dictionary? (Choose four.)
- A. stored procedure definitions
- B. view definitions
- C. server configuration rollback
- D. access control lists
- E. table definitions
- F. InnoDB buffer pool LRU management data
- G. performance metrics
- H. server runtime configuration
Answer: A,B,C,E
NEW QUESTION # 52
You have replication configured, which consists of one master and one slave on different hosts with an asynchronous replication channel between them.
Your goal is to decrease the amount of data that is transferred between these two hosts.
It is confirmed that the slave instance does not need to have data from the example database.
Which replication filter contributes to your goal?
- A. on master: --binlog-ignore-db=example
- B. on master: --replicate-ignore-db=example
- C. on slave: --replicate-ignore-db=example
- D. on slave: --replicate-wild-ignore=example.%
- E. on slave: --binlog-ignore-db=example
Answer: B
NEW QUESTION # 53
A colleague complains about slow response time on your website.
Examine this query and output:
What is the most likely cause for the high number of lock waits?
- A. The Innodb Buffer pool is full.
- B. You use the MyISAM storage engine for most common tables.
- C. You use the InnoDB storage engine and statements wait while data is inserted.
- D. Your table accesses wait for the operating system level flush.
Answer: C
NEW QUESTION # 54
An attempt to recover an InnoDB Cluster fails.
Examine this set of messages and responses:
host3:3377 ssl JS > dba.rebootClusterFromCompleteOutage() Reconfiguring the default cluster from complete outage...
The instance 'host1:3377'' was part of the cluster configuration. Would you like to rejoin it to the cluster? [y/N]: y The instance 'host2:3377' was part of the cluster configuration. Would you like to rejoin it to the cluster? [y/N]: y Dba.rebootClusterFromCompleteOutage: The active session instance isn't the most updated in comparison with the ONLINE instances of the Cluster's metadat a. Please use the most up to date instance: 'host1:3377'. (RuntimeError) Which statement is true?
- A. The instance deployed on host3 must be synchronized from a donor deployed on host1 by using the command cluster.addInstance('host1:3377').
- B. It is possible to determine the most up-to-date instance by comparing different global transaction identifier (GTID) sets with GTID_SUBSET(set1,set2).
- C. The cluster is running and there is at least one ONLINE instance.
- D. The instance deployed on host3 must be rebuilt with a backup from the primary instance.
- E. The active session instance is invalid and must be re-created by using the command shell.connect ('host3:3377').
Answer: A
NEW QUESTION # 55
You want to dump all databases with names that start with "db".
Which command will achieve this?
- A. mysqlpump > all_db_backup.sql
- B. mysqlpump --include-databases=db% --result-file=all_db_backup.sql
- C. mysqlpump --include-databases=db --result-file=all_db_backup.sql
- D. mysqlpump --include-tables=db.% --result-file=all_db_backup.sql
Answer: C
NEW QUESTION # 56
Examine this MySQL client command to connect to a remote database:
mysql -h remote.example.org -u root -p --protocol=TCP --ssl-mode=
Which two --ssl-mode values will ensure that an X.509-compliant certificate will be used to establish the SSL/TLS connection to MySQL?
- A. REQUIRED
- B. VERIFY_CA
- C. DISABLED
- D. VERIFY_IDENTITY
- E. PREFERRED
Answer: B,D
Explanation:
Explanation
https://dev.mysql.com/doc/refman/5.7/en/using-encrypted-connections.html
NEW QUESTION # 57
Your MySQL instance is capturing a huge amount of financial transactions every day in the finance database.
Company policy is to create a backup every day.
The main tables being updated are prefixed with transactions-.
These tables are archived into tables that are prefixed with archives- each month. mysqlbackup
--optimistic-busy-tables="^finance\.transactions-.*" backup
Which optimization process best describes what happens with the redo logs?
- A. The redo logs are backed up first, then the transaction and archive tables.
- B. The redo logs are not backed up at all.
- C. The redo logs are backed up only if there are changes showing for the transactions tables.
- D. The transaction tables are backed up first, then the archive tables and redo logs.
- E. The archive tables are backed up first, then the transaction tables and redo logs.
Answer: C
NEW QUESTION # 58
You have a MySQL system with 500 GB of data that needs frequent backups.
You use a mix of MyISAM and InnoDB storage engines for your dat
a. Examine your backup requirement:
The MySQL system being backed up can never be unavailable or locked to the client applications.
The recovery from the backup must work on any system.
Only 1 hour of data can be lost on recovery of the backup.
Which option fulfills all backup requirements?
- A. Use the Clone Plugin to copy the data to another MySQL system.
- B. Take a physical backup of the MySQL system.
- C. Take a logical backup of the MySQL system.
- D. Take your backup from a slave of the MySQL system.
Answer: C
NEW QUESTION # 59
You have configured GTID-based asynchronous replication with one master and one slave.
A user accidentally updated some data on the slave.
To fix this, you stopped replication and successfully reverted the accidental changes. Examine the current GTID information:
You must fix GTID sets on the slave to avoid replicating unwanted transactions in case of failover. Which set of actions would allow the slave to continue replicating without erroneous transactions?
- A. SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-2312,bbbbbbbb- bbbb-bbbb-bbbb-bbbbbbbbbbbb:1-9; SET GLOBAL gtid_executed=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167;
- B. RESET SLAVE;
SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167; - C. RESET MASTER;
SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167; - D. RESET MASTER;
SET GLOBAL gtid_purged-aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-2312;
SET GLOBAL gtid_executed=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10167; - E. RESET SLAVE;
SET GLOBAL gtid_purged=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-3820;
SET GLOBAL gtid_executed=aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa:1-10300;
Answer: D
NEW QUESTION # 60
Which statement is true about cold backups?
- A. They are good to use if only data structures must be backed up but not log files.
- B. They are backups taken from OS copy commands.
- C. They are backups taken from snapshots of a running database.
- D. They are good to use when many users are online accessing the database.
Answer: C
NEW QUESTION # 61
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